Actually I am very happy that this coliseum got ruined. And I wish that prizes get refused.
I see so many European players getting into top 20 every coliseum and they are getting very rich with this mode. Half of the world don't get chance and they get cr so easily with no challenge

What they need to do is add a new game mode that doesn't seem like the same game with a minor tweak. My suggestion for a new game mode: a 10 life/10 pill version of the game that requires decks to be built WITHOUT max-levelled cards. It'd force people to think harder about card choices, would shift the balance of the UR economy into something a bit more "interesting", and would technically be fair to all levels due to the abundance of 0xp cards being given away (from duels, missions, and packs).